| ANRITSU COMPANY Patent applications |
| Patent application number | Title | Published |
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| 20110306314 | FREQUENCY-SCALABLE SHOCKLINE-BASED VNA - A high-frequency VNA system is provided using non-linear transmission line (NLTL or shockline) based samplers configured to provide scalable operation characteristics. Scaling to adjust noise performance vs. frequency is accomplished as follows: (1) increasing or decreasing the fall time of a shockline's output voltage waveform. This is accomplished by changing the number of Schottky varactors in a shockline, as well as changing the shockline's Bragg cutoff frequency by setting the spacing between Schottky varactors; (2) changing the structure of the pulse-forming network connected with the sampler by changing the length of the differentiator arms in the sampler pulse-forming network; and (3) changing the LO signal frequency applied to the shockline. Multiple NLTL based samplers are multiplexed to form a broadband reflectometer with the multiplexing circuitry selectively connecting one of the NLTL based sampler segments at a time to allow user selection of a desired performance vs. frequency response for each segment. | 12-15-2011 |
| 20110304318 | FREQUENCY-SCALABLE SHOCKLINE-BASED SIGNAL-SOURCE EXTENSIONS - A system is provided using one or more shocklines or non-linear transmission lines (NLTLs) to extend the bandwidth of an RF signal source. Extension of the RF bandwidth is achieved by means of multiplexing as well as frequency scaling. Frequency scaling tailors the performance of each NLTL for operation in a particular output frequency band(s) by adjusting the varactor spacing in the NLTL. Multiplexing amalgamates the output frequency bands of one or more NLTLs, thus resulting in a broad output frequency range. | 12-15-2011 |
| 20110291706 | ELIMINATION OF FRACTIONAL N BOUNDARY SPURS IN A SIGNAL SYNTHESIZER - A portable frequency synthesizer is provided with fine tuning over a broad bandwidth using a Fractional N type Delta Sum Phase Locked Loop circuit that enables elimination of boundary value spurs. In the system, frequencies where spurs occur are calculated to define a region of fractional N values that cannot be used with a first time base. To avoid the boundary spurs, a second time base reference is selected that can generate boundary spurs that do not overlap with the first time base. Circuitry is provided to select the appropriate time base and the fractional N values to generate desired output frequencies throughout the synthesizer range while avoiding the boundary spurs. | 12-01-2011 |
| 20110098014 | DYNAMIC SPUR AVOIDANCE FOR HIGH SPEED RECEIVERS - A system and method for implementing dynamic spur avoidance in a high speed receiver environment is provided. For a plurality of radio frequency (RF) input signal ranges, a range of intermediate frequency (IF) signals and a noise floor for each IF signal is determined. An identification of spurs that will affect the noise floor is also determined from a look up table for each range of the RF inputs. A frequency plan that sets local oscillator and constituent oscillator signals is selected such that the IF signals generated from the RF input will avoid lower order spurious responses of the identified spurs within the IF signal range. | 04-28-2011 |
| 20110013733 | VARIABLE GAIN CONTROL FOR HIGH SPEED RECEIVERS - A high speed receiver is provided using two parallel processing paths to enable rapid variable gain control. The parallel processing paths include a first processing path using a high resolution Discrete Fourier Transform (DFT), and a second processing path using a reduced DFT requiring fewer samples than the high resolution DFT. An initial sample of the data is processed using the second processing path with the reduced DFT by comparing a Fourier transform of the initial sample with predetermined threshold values. As a result of the comparison of the Fourier transform of the initial sample with the predetermined threshold values, a gain determination block determines whether a requirement exists for gain ranging. If gain ranging is needed, the gain of the data signal is adjusted and the gain ranging process repeats. | 01-20-2011 |
| 20100330944 | APPARATUS FOR ENHANCING THE DYNAMIC RANGE OF SHOCKLINE-BASED SAMPLING RECEIVERS - Shockline-based samplers of a vector-network analyzer (VNA) have enhanced dynamic range by using a dynamic bias network applied to the non-linear transmission lines (NLTLs) or shocklines. The bias voltage applied to the NLTL provides direct control over the falling-edge shockline compression, and thus the insertion loss and overall RF bandwidth of the sampler. Alternating between a forward bias voltage to turn off a shockline sampler when it is not needed and thereby reducing spurious generation and improving isolation can be alternatively applied with a reverse bias voltage to turn on the shockline sampler in a normal operation mode. By measuring the shockline output and providing feedback in the reverse-bias mode, the bias voltage can be dynamically adjusted to significantly increase the performance of the NLTL based sampler. In the presence of a strong positive bias voltage, the incoming LO and its harmonics experience large ohmic losses thus preventing gating pulses from forming in the shockline. The ohmic losses enable strong isolation between the LO sampling channels and will increase spectral purity at the VNA test ports. | 12-30-2010 |
| 20100164504 | PASSIVE INTERMODULATION (PIM) DISTANCE TO FAULT ANALYZER WITH SELECTABLE HARMONIC LEVEL - A distance to PIM measurement circuit is made using a device such as an AWS transceiver that has separate transmit and receive bands. With a typical AWS transceiver placed in close proximity to a PCS transceiver, the AWS device will include a band reject filter to eliminate interference from the PCS signals. The PIM measurement circuit includes two frequency sources F | 07-01-2010 |
| 20100141238 | MINIATURE RF CALIBRATOR UTILIZING MULTIPLE POWER LEVELS - A small light-weight battery operated calibrator device provides a precise sine wave output for use in calibration of test equipment, such as a RF Power Meter or a Spectrum Analyzer. The calibration device includes two power levels, one −40 dBm and one 0 dBm. The purpose of the two power levels is to obtain a slope and offset for correction of the RF power measuring device being calibrated. Operation indication LED lights are provided to indicate which of the two powers are in use, and if battery power is below acceptable levels. Miniature low power components including a crystal oscillator and a divide by 2 integrated circuit that generates a precise square wave and a low pass filter for converting the square wave into a precise sine wave allows the calibrator to be battery operated and stored as a calibration component. | 06-10-2010 |
| 20100105347 | APPARATUS TO DETECT INTERFERENCE IN WIRELESS SIGNALS - An apparatus to detect interference in wireless signals, comprising an antenna for receiving a wireless signal; and wherein the apparatus is operable to identify a dominant waveform in the received signal; subtract the dominant waveform from the received signal to create a modified received signal; and repeat the above steps, recursively substituting the modified received signal for the received signal, until all adjusted reference waveforms have been subtracted. | 04-29-2010 |
| 20100105346 | METHOD TO DETECT INTERFERENCE IN WIRELESS SIGNALS - A method to detect interference in wireless signals, comprising sampling a received signal; identifying a dominant waveform in the received signal; subtracting the dominant waveform from the received signal to create a modified received signal; and repeating the above steps, recursively substituting the modified received signal for the received signal, until all adjusted reference waveforms have been subtracted. | 04-29-2010 |
| 20100085061 | CALIBRATED TWO PORT PASSIVE INTERMODULATION (PIM) DISTANCE TO FAULT ANALYZER - A PIM measurement circuit enables making forward and reverse PIM measurements on any 1 port (reflection) or 2 port (transmission) device with the ability to determine in distance where individual PIM impairments are located as well as their magnitude. The PIM measurement circuit includes two frequency sources that are provided through a combiner for a CW characterization of the PIM circuit. To enable distance determination, an FM measurement is created by using a saw tooth offset sweep generator attached to one of the two frequency sources. With downconversion and processing of signals from the PIM impairments, the FM signal provides a frequency variation that is converted using a Fourier transform or spectrum analysis for separation of frequencies, enabling determination of the distance of the PIM sources as well as their magnitudes. | 04-08-2010 |
| 20090296829 | METHOD AND SYSTEM TO EXTEND A USEABLE BANDWIDTH OF A SIGNAL GENERATOR - A system to extend an operating bandwidth of a signal generator comprises a signal generator, an output port, a first transmission line extending between the signal generator and the output port, a mixer adapted to receive a first signal from the signal generator, a local oscillator adapted to provide a second signal to the mixer to beat against the first signal, a second transmission line extending from the mixer to transmit a plurality of output signals of the mixer, and one or more channels couplable between the first transmission line and the second transmission line. The one or more channels include a first coupler having a length adapted to couple one or more of the output signals within a band of frequencies from the second transmission line to the channel, a second coupler having a length adapted to couple the one or more of the output signals from the channel to the first transmission line, and a filter arranged between the first coupler and the second coupler. | 12-03-2009 |
| 20090264080 | METHOD AND APPARATUS TO ESTIMATE WIRELESS BASE STATION SIGNAL QUALITY OVER THE AIR - The quality of the signal from a base station is measured and adjusted for distortion due to multipath and due to signals from neighboring co-channel base stations. The signal quality is measured conventionally by determining Rho or EVM and then Rho or EVM are adjusted. To adjust the signal the process includes the steps of: (a) sampling a received CDMA base station signal in a particular frequency channel, calculating the total received power to provide a reference value for subsequent normalization; (b) demodulating the received signal and constructing an ideal reference signal; (c) correlating between the ideal reference signal and received signal to determine a Rho value, or calculating the ratio of the difference between ideal and received signal to the ideal signal to obtain EVM; (d) performing a self cross correlation to separate signals from the sampled received signal on different delay paths, and determining a multipath power value x as a total power of signals on non-dominant ones of the delay paths; (e) performing a code correlation pilot scan of the sampled signal to determine strengths of signals from neighboring co-channel base stations; (f) summing the power levels of the neighboring co-channel base station signals to provide a total pilot pollution power y; and (g) calculating an adjusted Rho or EVM by removing x and y from the total received power. | 10-22-2009 |
| 20090199141 | SYSTEMS AND METHODS FOR PROTOTYPING AND TESTING ELECTRICAL CIRCUITS IN NEAR REAL-TIME - A system for fabricating, testing, and modifying a prototype of an electrical circuit comprises a materials printer including a holder for positioning a substrate. The materials printer is adapted to receive information describing the prototype and is further adapted to fabricate the prototype on the substrate based on the information. An electrical measuring instrument associated with the holder is adapted to be placed in electrical communication with the prototype when the prototype is received by the holder. A display device receives a plurality of measurements of the prototype from the electrical measuring instrument. | 08-06-2009 |
| 20090191834 | ENHANCED PROGRAMMABLE AUTOMATIC LEVEL CONTROL - An enhanced programmable automatic level control loop comprising an input for receiving an input RF signal; a level modulator, wherein the level modulator receives the input RF signal and a control signal and wherein the level modulator produces a first signal; a mixer that receives the first signal and mixes it with an LO signal to produce a second signal; a programmable attenuator that receives the second signal and produces an output signal; a level detector that monitors RF power of the output signal and produces a DC voltage proportional to the RF power; and wherein the DC voltage is received at a loop amplifier which produces the control signal. | 07-30-2009 |
| 20090161743 | INTEGRATED COMPACT EYE PATTERN ANALYZER FOR NEXT GENERATION NETWORKS - A portable hand-held battery powered eye pattern analyzer is provided that can analyze signal quality of a high speed digital communication network. The system is 10 times smaller in volume and 4 times lighter than the bench-top equivalent instruments. The system includes a housing containing a display, keypad, power supply, battery pack, and RF sampler board along with connections for electrical inputs, optical inputs, clock signal inputs, and clock recovery signal inputs. The sampler circuit board can support connections, such as a USB plug for attachment to a personal computer. The RF sampler board contains the following elements: (1) A dual sampler for two-channel electrical inputs. (2) An Optical-to-Electrical O/E conversion module. (3) A clock recovery unit (CRU) module to recover the clock from the electrical or optical pulse pattern signal. (4) A trigger circuit that accepts an input clock and uses that clock to trigger the sampling of the data signal. (5) A PRBS generator that could be used as stimulus for testing high speed devices, and (6) A controller such as an FPGA that processes the sampled signals and provides statistical analysis along with eye patterns to a display as controlled using the keyboard. | 06-25-2009 |
| 20090160430 | HAND-HELD MICROWAVE SPECTRUM ANALYZER WITH OPERATION RANGE FROM 9 KHz TO OVER 20 GHz - A spectrum analyzer is provided that includes components to achieve from below 9 kHz to above 20 GHz operation range while remaining hand-held. Components of the spectrum analyzer include an integrated precision stand-alone step attenuator that does not rely on printed circuit board (PCB) mounted circuit elements within the signal path. Further, a PIN diplexing switch separates signals into different base-band and highband paths. The baseband path includes a pre-amplifier for low frequency signals, while the higher frequency bands may not necessarily include a pre-amplifier. The baseband path further provides improved broadband termination of its 1 | 06-25-2009 |
| 20090098847 | APPARATUS FOR EXTENDING THE BANDWIDTH OF A SPECTRUM ANALYZER - A spectrum analyzer is provided with frequency-scalable circuit architectures that extend the bandwidth of the spectrum analyzer using an array of couplers. The array of couplers is distributed along the RF signal path at one end, and interfaced to one or more frequency-translation devices such as mixers or samplers at the other. In a first architecture, a single mixer is employed with an LO signal applied to one input and coupler outputs providing RF signals to another input, with switching controlled to select one coupler's RF output to provide to the mixer. In a second architecture, a separate mixer is used, one for each coupler RF signal, with switches selecting one of the mixer IF outputs to select a desired output frequency. Both the first and second embodiments eliminate switching and its associated loss and frequency limitations from the main RF signal path to enable wideband high-dynamic-range spectrum analysis. | 04-16-2009 |
| 20090072915 | MINIATURE RF CALIBRATOR UTLIIZING MULTIPLE POWER LEVELS - A small light-weight battery operated calibrator device provides a precise sine wave output for use in calibration of test equipment, such as a RF Power Meter or a Spectrum Analyzer. The calibration device includes two power levels, one −40 dBm and one 0 dBm. The purpose of the two power levels is to obtain a slope and offset for correction of the RF power measuring device being calibrated. Operation indication LED lights are provided to indicate which of the two powers are in use, and if battery power is below acceptable levels. Miniature low power components including a crystal oscillator and a divide by 2 integrated circuit that generates a precise square wave and a low pass filter for converting the square wave into a precise sine wave allows the calibrator to be battery operated and stored as a calibration component. | 03-19-2009 |
| 20090061844 | SYSTEM AND METHOD FOR COLLECTING, ARCHIVING, AND ACCESSING DATA ON BASE TRANSCEIVER STATION PERFORMANCE - The present invention is in the field of base station and network infrastructure maintenance. One embodiment is a method, comprising: collecting base transceiver station performance data into a performance analysis and data collection application; transmitting the base transceiver station performance data wirelessly to a mobile application on a mobile device; and uploading the base transceiver station performance data from the mobile application on the mobile device wirelessly over an internet through a mobile network into a web application. One embodiment is a system, comprising: a base station analyzer for measuring base transceiver station performance, wherein the base station analyzer has wireless access to a mobile application on a mobile device; and the mobile application on the mobile device, wherein the mobile application on the mobile device has wireless access through the internet across a mobile network to a web application. | 03-05-2009 |
| 20080290912 | ANALOG PSEUDO RANDOM BIT SEQUENCE GENERATOR - A Pseudo Random Bit Sequence (PRBS) generator is provided with components to enable operation at very high microwave frequencies with inexpensive components. The PRBS generator initially replaces the D flip-flops of a conventional PRBS generator with delay lines connected in a similar manner. Further, an exclusive OR (EXOR) gate used in a conventional device is replaced in one embodiment by a mixer and amplifier. In another embodiment, the EXOR gate is replaced by a Gilbert Cell. In some embodiments, complementary outputs of an EXOR gate are connected to separate delay lines to reduce components needed for the PRBS generator. | 11-27-2008 |
| 20080258738 | CHARACTERIZING TEST FIXTURES - Provided herein are techniques for characterizing a test fixture that is used for connecting a device under test (DUT) to a vector network analyzer (VNA), e.g., to thereby enable de-embedding of the test fixture from measurements of the DUT connected to the test fixture. In an embodiment, the test fixture is separated into 4-port test fixture segments, based on which ports of the DUT have internal coupling. Each test fixture segment has an outer 2-port reference plane and an inner 2-port reference plane. A 4-port calibration is performed at outer planes of the two test fixture segments, while corresponding ports of the inner planes of the test fixture segments are connected together with thru segments, to thereby determine a thru set of S-parameters. A set of S-parameters is determined for each of the 4-port test fixture segments, based on the thru set of S-parameters. | 10-23-2008 |
| 20080252298 | BROADBAND MICRO-MACHINED THERMAL POWER SENSOR - A power sensor comprises a substrate, an insulating membrane associated with the substrate, and an electro-thermal transducer partially supported by the insulating membrane. The electro-thermal transducer includes an impedance matched load spaced from the substrate by the insulating membrane, and a thermopile partially spaced from the substrate by the insulating membrane and partially arranged on the substrate, the thermopile being adapted to generate, a voltage in response to heat generated in the impedance matched load. An electrically conductive member connected with the impedance matched load to guide electromagnetic signals to the electro-thermal transducer. | 10-16-2008 |
| 20080246551 | INTERLEAVED NON-LINEAR TRANSMISSION LINES FOR SIMULTANEOUS RISE AND FALL TIME COMPRESSION - A non-linear waveguide comprises a transmission line including a first conductive line and a second conductive line; a first bias voltage supply connected with the transmission line; and one or more pairs of diodes connected between the first conductive line and the second conductive line, the one or more pairs of diodes including: a first diode having an anode connected with the first conductive line and a cathode connected with the second conductive line; a second diode having a cathode connected with the first conductive line and an anode connected with the second conductive line; and a second bias voltage supply connected between the anode of the second diode and the second conductive line. | 10-09-2008 |
| 20080197858 | AUTOMATIC CALIBRATION TECHNIQUES WITH IMPROVED ACCURACY AND LOWER COMPLEXITY FOR HIGH FREQUENCY VECTOR NETWORK ANALYZERS - A calibration module, for use in calibrating a VNA, includes ports connectable to the VNA, calibration standards, and single pole multi throw (SPMT) switches. Each SPMT includes a single pole terminal, multiple throw terminals and a shunt terminal corresponding to each multiple throw terminal. A switching path is between each throw terminal and the single pole terminal, and between each shunt terminal and the single pole terminal. Each switching path includes at least one solid state switching element. The calibration standards are selectively connectable to the ports of the calibration module by selectively controlling the switching elements. Each port of the calibration module is directly connected to a throw terminal of one of the SPMT switches. Also, unique algorithm are provided for calibrating a VNA when using a calibration impedance that is a hybrid of a reflect standard and a transmission standard, which can be achieved using the calibration module. | 08-21-2008 |
